Refrigeration & Air-Conditioning Practice Set-3

May 18, 2021

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1. A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

2. The operating pressure for refrigerating units using R-12 as a refrigerant is

3. The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is

4. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

5. In a refrigeration system, the expansion device is connected between the

6. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

7. For obtaining high COP, the pressure range of compressor should be

8. Which of the following cycles uses air as the refrigerant?

9. Rating of a domestic refrigerator is of the order of

10. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process


 

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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